react-native/Libraries/Blob/RCTFileReaderModule.m

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Implement Blob support for XMLHttpRequest Summary: This PR is a followup to https://github.com/facebook/react-native/pull/11417 and should be merged after that one is merged. 1. Add support for creating blobs from strings, not just other blobs 1. Add the `File` constructor which is a superset of `Blob` 1. Add the `FileReader` API which can be used to read blobs as strings or data url (base64) 1. Add support for uploading and downloading blobs via `XMLHttpRequest` and `fetch` 1. Add ability to download local files on Android so you can do `fetch(uri).then(res => res.blob())` to get a blob for a local file (iOS already supported this) 1. Clone the repo https://github.com/expo/react-native-blob-test 1. Change the `package.json` and update `react-native` dependency to point to this branch, then run `npm install` 1. Run the `server.js` file with `node server.js` 1. Open the `index.common.js` file and replace `localhost` with your computer's IP address 1. Start the packager with `yarn start` and run the app on your device If everything went well, all tests should pass, and you should see a screen like this: ![screen shot 2017-06-08 at 7 53 08 pm](https://user-images.githubusercontent.com/1174278/26936407-435bbce2-4c8c-11e7-9ae3-eb104e46961e.png)! Pull to rerun all tests or tap on specific test to re-run it [GENERAL] [FEATURE] [Blob] - Implement blob support for XMLHttpRequest Closes https://github.com/facebook/react-native/pull/11573 Reviewed By: shergin Differential Revision: D6082054 Pulled By: hramos fbshipit-source-id: cc9c174fdefdfaf6e5d9fd7b300120a01a50e8c1
2018-01-26 17:06:14 +00:00
/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
Implement Blob support for XMLHttpRequest Summary: This PR is a followup to https://github.com/facebook/react-native/pull/11417 and should be merged after that one is merged. 1. Add support for creating blobs from strings, not just other blobs 1. Add the `File` constructor which is a superset of `Blob` 1. Add the `FileReader` API which can be used to read blobs as strings or data url (base64) 1. Add support for uploading and downloading blobs via `XMLHttpRequest` and `fetch` 1. Add ability to download local files on Android so you can do `fetch(uri).then(res => res.blob())` to get a blob for a local file (iOS already supported this) 1. Clone the repo https://github.com/expo/react-native-blob-test 1. Change the `package.json` and update `react-native` dependency to point to this branch, then run `npm install` 1. Run the `server.js` file with `node server.js` 1. Open the `index.common.js` file and replace `localhost` with your computer's IP address 1. Start the packager with `yarn start` and run the app on your device If everything went well, all tests should pass, and you should see a screen like this: ![screen shot 2017-06-08 at 7 53 08 pm](https://user-images.githubusercontent.com/1174278/26936407-435bbce2-4c8c-11e7-9ae3-eb104e46961e.png)! Pull to rerun all tests or tap on specific test to re-run it [GENERAL] [FEATURE] [Blob] - Implement blob support for XMLHttpRequest Closes https://github.com/facebook/react-native/pull/11573 Reviewed By: shergin Differential Revision: D6082054 Pulled By: hramos fbshipit-source-id: cc9c174fdefdfaf6e5d9fd7b300120a01a50e8c1
2018-01-26 17:06:14 +00:00
*/
#import "RCTFileReaderModule.h"
#import <React/RCTBridge.h>
#import <React/RCTConvert.h>
#import "RCTBlobManager.h"
@implementation RCTFileReaderModule
RCT_EXPORT_MODULE(FileReaderModule)
@synthesize bridge = _bridge;
RCT_EXPORT_METHOD(readAsText:(NSDictionary<NSString *, id> *)blob
encoding:(NSString *)encoding
resolve:(RCTPromiseResolveBlock)resolve
reject:(RCTPromiseRejectBlock)reject)
{
RCTBlobManager *blobManager = [[self bridge] moduleForClass:[RCTBlobManager class]];
NSData *data = [blobManager resolve:blob];
if (data == nil) {
reject(RCTErrorUnspecified,
[NSString stringWithFormat:@"Unable to resolve data for blob: %@", [RCTConvert NSString:blob[@"blobId"]]], nil);
} else {
NSStringEncoding stringEncoding;
if (encoding == nil) {
stringEncoding = NSUTF8StringEncoding;
} else {
stringEncoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((CFStringRef) encoding));
}
NSString *text = [[NSString alloc] initWithData:data encoding:stringEncoding];
resolve(text);
}
}
RCT_EXPORT_METHOD(readAsDataURL:(NSDictionary<NSString *, id> *)blob
resolve:(RCTPromiseResolveBlock)resolve
reject:(RCTPromiseRejectBlock)reject)
{
RCTBlobManager *blobManager = [[self bridge] moduleForClass:[RCTBlobManager class]];
NSData *data = [blobManager resolve:blob];
if (data == nil) {
reject(RCTErrorUnspecified,
[NSString stringWithFormat:@"Unable to resolve data for blob: %@", [RCTConvert NSString:blob[@"blobId"]]], nil);
} else {
NSString *type = [RCTConvert NSString:blob[@"type"]];
NSString *text = [NSString stringWithFormat:@"data:%@;base64,%@",
type != nil && [type length] > 0 ? type : @"application/octet-stream",
[data base64EncodedStringWithOptions:0]];
resolve(text);
}
}
@end